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-/*************************************************************************
-** XXHashFunction.hpp **
-** **
-** This file is part of dvisvgm -- a fast DVI to SVG converter **
-** Copyright (C) 2005-2021 Martin Gieseking <martin.gieseking@uos.de> **
-** **
-** This program is free software; you can redistribute it and/or **
-** modify it under the terms of the GNU General Public License as **
-** published by the Free Software Foundation; either version 3 of **
-** the License, or (at your option) any later version. **
-** **
-** This program is distributed in the hope that it will be useful, but **
-** WITHOUT ANY WARRANTY; without even the implied warranty of **
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
-** GNU General Public License for more details. **
-** **
-** You should have received a copy of the GNU General Public License **
-** along with this program; if not, see <http://www.gnu.org/licenses/>. **
-*************************************************************************/
-
-#ifndef XXHASHFUNCTION_HPP
-#define XXHASHFUNCTION_HPP
-
-#include <xxhash.h>
-#include "HashFunction.hpp"
-#include "utility.hpp"
-
-#if (XXH_VERSION_NUMBER >= 701) && defined(XXH3_SECRET_SIZE_MIN)
-#define ENABLE_XXH128
-#endif
-
-template <int HASH_SIZE>
-struct XXHInterface {
-};
-
-template<>
-struct XXHInterface<4> {
- using State = XXH32_state_t;
- using Digest = XXH32_hash_t;
- static constexpr auto createState = &XXH32_createState;
- static constexpr auto freeState = &XXH32_freeState;
- static constexpr auto reset = &XXH32_reset;
- static constexpr auto update = &XXH32_update;
- static constexpr auto digest = &XXH32_digest;
-};
-
-template<>
-struct XXHInterface<8> {
- using State = XXH64_state_t;
- using Digest = XXH64_hash_t;
- static constexpr auto createState = &XXH64_createState;
- static constexpr auto freeState = &XXH64_freeState;
- static constexpr auto reset = &XXH64_reset;
- static constexpr auto update = &XXH64_update;
- static constexpr auto digest = &XXH64_digest;
-};
-
-#ifdef ENABLE_XXH128
-template<>
-struct XXHInterface<16> {
- using State = XXH3_state_t;
- using Digest = XXH128_hash_t;
- static constexpr auto createState = &XXH3_createState;
- static constexpr auto freeState = &XXH3_freeState;
- static constexpr auto reset = &XXH3_128bits_reset_withSeed;
- static constexpr auto update = &XXH3_128bits_update;
- static constexpr auto digest = &XXH3_128bits_digest;
-};
-#endif
-
-/** Implements the HashFunction class for the xxHash algorithms. */
-template <int HASH_BYTES>
-class XXHashFunction : public HashFunction {
- using Interface = XXHInterface<HASH_BYTES>;
- public:
- XXHashFunction () : _state(Interface::createState()) {Interface::reset(_state, 0);}
- XXHashFunction (const char *data, size_t length) : XXHashFunction() {update(data, length);}
- explicit XXHashFunction(const std::string &data) : XXHashFunction() {update(data);}
- explicit XXHashFunction(const std::vector<uint8_t> &data) : XXHashFunction() {update(data);}
- ~XXHashFunction () override {Interface::freeState(_state);}
- int digestSize () const override {return HASH_BYTES;}
- void reset () override {Interface::reset(_state, 0);}
- void update (const char *data, size_t length) override {Interface::update(_state, data, length);}
- void update (const std::string &data) override {update(data.data(), data.length());}
- void update (const std::vector<uint8_t> &data) override {update(reinterpret_cast<const char*>(data.data()), data.size());}
-
- using HashFunction::update; // unhide update(istream &is) defined in base class
-
- std::vector<uint8_t> digestBytes () const override {
- return util::bytes(Interface::digest(_state), HASH_BYTES);
- }
-
- typename Interface::Digest digestValue () const {return Interface::digest(_state);}
- static unsigned version () {return XXH_versionNumber();}
-
- private:
- typename Interface::State *_state;
-};
-
-using XXH32HashFunction = XXHashFunction<4>;
-using XXH64HashFunction = XXHashFunction<8>;
-
-#ifdef ENABLE_XXH128
-using XXH128HashFunction = XXHashFunction<16>;
-
-template<>
-inline std::vector<uint8_t> XXHashFunction<16>::digestBytes () const {
- std::vector<uint8_t> hash;
- auto digest = Interface::digest(_state);
- for (auto chunk : {digest.high64, digest.low64}) {
- auto bytes = util::bytes(chunk);
- hash.insert(hash.end(), bytes.begin(), bytes.end());
- }
- return hash;
-}
-#endif
-
-#endif